McCulloch PRO MAC 310 600042-08 chainsaw Parts

To identify your Mcculloch chainsaw model, we look for the model marking on the saw itself, usually stamped into the crankcase or printed on an ID tag. Once you find that model identifier, match it to the parts listing so you get the correct chain, bar, carburetor, and fuel system parts.

Where to find the model identifier on the saw

Check these common locations on Mcculloch gas chainsaws:

• Underside of the crankcase (often stamped into the metal case)
• Near the handle or rear housing on a label or plate
• Starter housing area (recoil starter cover)
• By the bar mount (clutch cover side) on some versions
• Stamped numbers near the crankcase split line (case halves)

If you see multiple numbers, write them all down (model, type, and any serial or PROduction codes). Those extra codes help narrow down the exact version.

How to use what you find

Once you have the model marking:

1. Compare it to the model shown on the parts page (for this listing, the model is PRO).
2. If your stamping includes additional digits (for example, a series or type code), use that full string when searching.
3. Confirm fit by checking that the illustrated parts list matches what you see on your saw (air filter style, carburetor layout, fuel line routing).

For broader model lookups and parts searches by the full model marking you found, use Sears PartsDirect.

Quick checklist: what to record

What to record	Example format	Why it matters
Model marking	Letters and numbers	Ensures correct parts diagrams
Type/series code	Extra digits after model	Distinguishes similar versions
Serial/PROduction code	Longer stamped number	Helps match running changes

Why it matters

Mcculloch chainsaws often have multiple versions that look similar but use different ignition parts, carburetor settings, fuel lines, or bar and chain setups. Using the exact model marking prevents ordering the wrong replacement parts and speeds up troubleshooting.

Last updated: February 2026

For the Mcculloch PRO chainsaw model shown on this page, the engine displacement (cc) is not identified by the model number PRO alone. We match cc by the full model and engine family; use the complete model tag (for example, PRO MAC 310 600042-08) when looking up specs and parts on Sears PartsDirect.

How to identify the correct cc on your saw

Check these spots on the chainsaw and record the exact numbers and letters:

• The model and serial tag on the starter housing or rear handle area
• Any engine ID plate on the crankcase (often near the muffler side)
• The full model string (example format: PRO MAC 310 600042-08)
• Any stamped numbers on the cylinder or recoil cover

Typical cc ranges (so you know what to expect)

Most gas chainsaws fall into these displacement ranges:

Chainsaw class	Typical displacement	Typical use
Light duty	30 to 40 cc	Limbing, small trees
Mid-range	40 to 55 cc	Firewood, medium cutting
Heavy duty	55 to 70+ cc	Larger hardwood, frequent use

Why it matters

Cc affects bar-and-chain load, fuel mix demand, and carburetor tuning. Using the wrong spec can lead to poor cutting performance, hard starting, or overheating.

If you are asking because it will not start or runs poorly

Before chasing cc, we recommend basic fuel and ignition checks:

• Drain old fuel and refill with fresh, correctly mixed 2-cycle fuel
• Inspect and gap/replace the spark plug if fouled
• Clean or replace the air filter
• Confirm the choke and throttle linkage move freely
• Check for cracked fuel lines or a leaking primer bulb

For step-by-step troubleshooting, use our DIY resources like tips for a hard to start chainsaw.

Last updated: February 2026

For the Mcculloch PRO (PRO MAC 310 600042-08) chainsaw, the correct guide bar size is the length that matches your exact bar mount pattern, chain pitch, and gauge; this model is commonly set up with a 16-inch bar, and some configurations use a 14-inch bar.

How to confirm the bar size on your PRO MAC 310

Use what is already on the saw as your baseline, then match the replacement bar and chain to those specs.

• Measure the cutting length from the front of the powerhead to the bar tip
• Check the bar stamp for length, pitch, and gauge (usually near the mounting slot)
• Match chain pitch to the drive sprocket (common sizes are .325 or 3/8 low PROfile)
• Match gauge to the bar groove (common sizes are .050 or .058)
• Confirm the bar tail mount pattern and oil hole alignment

What must match when you buy a replacement bar

Spec	Must match because	If it does not match
Bar length	Fit and balance	Poor handling, improper chain fit
Pitch	Chain and sprocket compatibility	Chain will not run correctly
Gauge	Fit in the bar groove	Chain binds, wobbles, or derails
Mount pattern	Physical fit and oiling	Bar will not mount or oil PROperly

Why it matters

A mismatched bar or chain can reduce cutting performance, prevent PROper bar oiling, and increase kickback risk. Matching length, pitch, gauge, and mount pattern keeps your Mcculloch chainsaw cutting smoothly and safely.

Helpful DIY resources we recommend

• Chainsaw common questions
• What are the most common replacement parts for chainsaws

If you need to look up compatible bars and chains by model, search PRO parts and diagrams on Sears PartsDirect.

Last updated: February 2026

For this Mcculloch chainsaw parts listing, the full model identification is PRO MAC 310 (600042-08), not just “PRO.” The exact age depends on your saw’s serial number and ID tag details; use those markings to narrow the PROduction year.

Identify the correct model information first

On older Mcculloch saws, small suffixes and assembly numbers matter for dating and parts matching.

• Find the ID plate or decal on the starter housing, rear handle area, or crankcase
• Write down the full model name: PRO MAC 310
• Record the assembly number: 600042-08
• Copy the serial number exactly (letters and numbers)
• Note any major features (chain brake style, ignition type, carburetor type)

How to estimate the PROduction era

Once you have the serial number and full tag info, you can narrow the timeframe by comparing your markings and features to known PRO MAC 310 PROduction runs and revisions.

What you have	What it tells you	What to do
Full model + assembly number	Confirms the exact variant	Match parts and diagrams to PRO MAC 310 (600042-08)
Serial number	Best clue to build sequence	Use it to narrow the year range for your specific saw
Feature changes (brake, ignition)	Helps separate early vs. later versions	Compare your saw’s configuration to the correct breakdown

If you are asking because it will not start

Age-related fuel system PROblems are the most common issue on vintage gas chainsaws.

• Drain old fuel and refill with fresh, correctly mixed fuel
• Check spark and replace the spark plug if fouled
• Inspect fuel lines and the fuel filter for cracks or softness
• If it fires briefly then dies, service the carburetor diaphragms

A step-by-step checklist is in tips for a hard to start chainsaw.

Why it matters

Using the correct full model designation (PRO MAC 310 with assembly number 600042-08) prevents wrong-part ordering and speeds up troubleshooting. If you need to search additional diagrams or parts by model number, use Sears PartsDirect.

Last updated: February 2026